Help me, the gsm module don't send SMS

[ymym0]

#include <SoftwareSerial.h>

SoftwareSerial SIM900A(8,9);

void setup()
{
  SIM900A.begin(9600);   // GSM Module Baud rate - communication speed 
  Serial.begin(9600);    // Baud rate of Serial Monitor in the IDE app
  Serial.println ("Text Messege Module Ready & Verified");
  delay(1000);
  Serial.println ("Type s to send message or r to receive message");
}

void loop()
{
  if (Serial.available()>0)
   switch(Serial.read())
  {
    case 's':
      SendMessage();
      break;
    case 'r':
      RecieveMessage();
      break;
  }

 if (SIM900A.available()>0)
   Serial.write(SIM900A.read());
}

 void SendMessage()
{
  Serial.println ("Sending Message please wait....");
  SIM900A.println("AT+CMGF=1");    //Text Mode initialisation 
  delay(1000);
  Serial.println ("Set SMS Number");
  SIM900A.println("AT+CMGS=\"+639927961461\"\r"); // Receiver's Mobile Number
  delay(1000);
  Serial.println ("Set SMS Content");
  SIM900A.println("Bhai kya haal hain? (Brother how are you?) this messege has been sent through Arduino Uno not a mobile phone wink wink ");// Messsage content
  delay(1000);
  Serial.println ("Done");
  SIM900A.println((char)26);//   delay(1000);
  Serial.println ("Message sent succesfully");
}


 void RecieveMessage()
{
  Serial.println ("Receiving Messeges");
  delay (1000);
  SIM900A.println("AT+CNMI=2,2,0,0,0"); // Eeceiving Mode Enabled
  delay(1000);
  Serial.write ("Messege Received Sucessfully");
 }

[UKHeliBob]

Your topic was MOVED to its current forum category which is more appropriate than the original as it has nothing to do with Installation and Troubleshooting of the IDE

[b707]

@ymym0

 void SendMessage()
{
  Serial.println ("Sending Message please wait....");
  SIM900A.println("AT+CMGF=1");    //Text Mode initialisation 
  delay(1000);
  Serial.println ("Set SMS Number");
  SIM900A.println("AT+CMGS=\"+639927961461\"\r"); // Receiver's Mobile Number
  delay(1000);
  Serial.println ("Set SMS Content");
  SIM900A.println("Bhai kya haal hain? (Brother how are you?) this messege has been sent through Arduino Uno not a mobile phone wink wink ");// Messsage content
  delay(1000);
  Serial.println ("Done");
  SIM900A.println((char)26);//   delay(1000);
  Serial.println ("Message sent succesfully");
}

When you send commands to the modem, it's not enough to just wait after each command - you need to receive and analyze the modem responses. The next command should be sent only after you receive the "OK" response to the previous one.

[ymym0]

#include <SoftwareSerial.h>

SoftwareSerial SIM900A(8,9);

void setup()
{
  SIM900A.begin(9600);   // GSM Module Baud rate - communication speed 
  Serial.begin(9600);    // Baud rate of Serial Monitor in the IDE app
  Serial.println ("Text Messege Module Ready & Verified");
  delay(1000);
  Serial.println ("Type s to send message or r to receive message");
}

void loop()
{
  if (Serial.available()>0)
   switch(Serial.read())
  {
    case 's':
      SendMessage();
      break;
    case 'r':
      RecieveMessage();
      break;
  }

 if (SIM900A.available()>1)
   Serial.write(SIM900A.read());
}

 void SendMessage()
{
  Serial.println ("Sending Message please wait....");
  SIM900A.println("AT+CMGF=1");    //Text Mode initialisation 
  delay(1000);
  Serial.println ("Set SMS Number");
  SIM900A.println("AT+CMGS=\"+639927961461\"\r"); // Receiver's Mobile Number
  delay(1000);
  Serial.println ("Set SMS Content");
  SIM900A.println("Bhai kya haal hain? (Brother how are you?) this messege has been sent through Arduino Uno not a mobile phone wink wink ");// Messsage content
  delay(1000);
  Serial.println ("Done");
  SIM900A.println((char)26);//   delay(1000);
  Serial.println ("Message sent succesfully");
}


 void RecieveMessage()
{
  Serial.println ("Receiving Messeges");
  delay (1000);
  SIM900A.println("AT+CNMI=2,2,0,0,0"); // Eeceiving Mode Enabled
  delay(1000);
  Serial.write ("Messege Received Sucessfully");
 }

[UKHeliBob]

Welcome to the forum

Your topic was MOVED to its current forum category which is more appropriate than the original as it has nothing to do with Installation and Troubleshooting of the IDE

[J-M-L]

please edit your post, select the code part and press the </> icon in the tool bar to mark it as code. It’s barely readable as it stands. (also make sure you indented the code in the IDE before copying, that’s done by pressing ctrlT on a PC or cmdT on a Mac)

—-

if (SIM900A.available()>1)

Why 1? 0 should be fine

[b707]

Please do not cross-post
This message is copy of this one:

Help me, the gsm module don't send SMS

#include <SoftwareSerial.h> SoftwareSerial SIM900A(8,9); void setup() { SIM900A.begin(9600); // GSM Module Baud rate - communication speed Serial.begin(9600); // Baud rate of Serial Monitor in the IDE app Serial.println ("Text Messege Module Ready & Verified"); delay(1000); Serial.println ("Type s to send message or r to receive message"); } void loop() { if (Serial.available()>0) switch(Serial.read()) { case 's': SendMessage(); break; case 'r': …

Flagged to moderator

[UKHeliBob]

Your two topics on the same or similar subject have been merged.

Please do not duplicate your questions as doing so wastes the time and effort of the volunteers trying to help you as they are then answering the same thing in different places.

Please create one topic only for your question and choose the forum category carefully. If you have multiple questions about the same project then please ask your questions in the one topic as the answers to one question provide useful context for the others, and also you won’t have to keep explaining your project repeatedly.

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